Aileron and LIGO: what they have in common

1. Step 1. Aileron — is part of — Aeroplane. Ailerons.
2. Step 2. Aeroplane — has part — Wing. A wing.
3. Step 3. Wing — is part of — Space Shuttle. It landed like a glider.
4. Step 4. Space Shuttle — is made of — Silica (sand). The heat-shield tiles are silica fibre.
5. Step 5. Silica (sand) — is material for — LIGO. The mirrors are fused silica.

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